Data for Carnivory vs Environmental diet for MixSIAR analyses: S. purpurea

<b>1.</b><b> </b>Carnivorous plants obtain nutrients from arthropod prey (carnivory) and their environment. However, little is known about the seasonal diet shifts between carnivory vs environment among co-occurring carnivorous plant species. Although studies reporting captured prey species for carnivorous plants are abundant, studies investigating the composition of assimilated prey species in their leaves are scarce. Here, we report spatiotemporal dynamics in carnivory vs environmental nutrient acquisition and compositional analysis of prey species assimilated in carnivorous plants of New England (USA).<b>2.</b><b> </b>We measured the natural abundance stable isotope ratios of aquatic <i>Utricularia inflata </i>(Lentibulariaceae), terrestrial <i>Sarracenia purpurea</i> (Sarraceniaceae), and <i>Drosera intermedia</i> (Droseraceae), and their nutrient sources during their growing season in two oligotrophic ponds in New England (USA). MixSIAR, a Bayesian stable isotope mixing model, was used to estimate the extent of carnivory for each plant species and the composition of prey species assimilated in terrestrial carnivorous plants.<b>3.</b><b> </b>Aquatic <i>U. inflata</i> spatiotemporally acquired more nutrients from carnivory (<i>c.</i> 70 to 100%) than terrestrial species (<i>c.</i> 30% to 60%). <i>Sarracenia purpurea</i> acquired nutrients mainly from Formicidae. The nutrient sources for <i>D. intermedia</i> varied spatiotemporally between arthropod species.<b>4.</b><b> </b>The large contribution of carnivory to the nutrient budget of <i>U. inflata</i> could be due to its lack of roots and high metabolic rate. <i>Sarracenia purpurea</i> and <i>D. intermedia</i> could effectively regulate the nutrient level in their habitat and / or could benefit from dissolved organic nitrogen in the environment. Our findings on prey compositions can be used as the first available prior information for the Bayesian approach in future studies. Understanding the sources of nutrients in carnivorous plants can provide invaluable insight into their ecophysiology and conservation and their fragile wetland ecosystems.

1. 食肉植物可通过捕食节肢动物（食肉营养策略）及从环境中获取两类营养来源。然而，目前学界对同域共存的食肉植物物种在食肉营养与环境营养获取间的季节性饮食偏移仍缺乏深入认知。尽管已有诸多研究报道了食肉植物所捕获的猎物类群，但针对其叶片内同化猎物物种组成的相关研究仍较为稀缺。本数据集记录了美国新英格兰地区食肉植物的食肉营养与环境营养获取的时空动态，并对其体内同化的猎物物种组成进行了分析。
2. 研究团队于美国新英格兰地区的两座贫营养池塘中，针对水生食肉植物Utricularia inflata（狸藻科 Lentibulariaceae）、陆生食肉植物Sarracenia purpurea（瓶子草科 Sarraceniaceae）与Drosera intermedia（茅膏菜科 Droseraceae），测定了其生长季内的自然丰度稳定同位素比值及其各类营养来源。本研究采用贝叶斯稳定同位素混合模型（MixSIAR），估算了每种植物的食肉营养占比，并分析了陆生食肉植物体内同化的猎物物种组成。
3. 水生食肉植物U. inflata通过食肉策略获取的营养占比（约70%~100%）显著高于陆生食肉植物（约30%~60%）。Sarracenia purpurea的主要营养来源为蚁科（Formicidae）昆虫，而Drosera intermedia的营养来源则随空间与时间在不同节肢动物类群间发生动态变化。
4. U. inflata的营养获取高度依赖食肉策略，这可能与其缺乏根系且代谢速率较高有关。Sarracenia purpurea与Drosera intermedia则可有效调控其栖息地的营养水平，或可从环境中的溶解态有机氮中获益。本研究关于猎物组成的发现，可作为未来研究中贝叶斯分析方法的首个可用先验信息。明晰食肉植物的营养来源，可为其生理生态学研究、物种保护以及脆弱的湿地生态系统研究提供宝贵的科学见解。